/Engine/Source/Runtime/Engine/Classes/Components/InstancedStaticMeshComponent.h
Add multiple instances to this component. Transform is given in local space of this component unless bWorldSpace is set.
virtual [TArray](API\Runtime\Core\Containers\TArray)< int32 > AddInstances ( const [TArray](API\Runtime\Core\Containers\TArray)< FTransform > & InstanceTransforms, bool bShouldReturnIndices, bool bWorldSpace )